[builtins] Migrate String.prototype.charCodeAt and String.prototype.charAt to TurboFan.

src/runtime/runtime.h

Index: src/runtime/runtime.h
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 367a2cdc6e84c9e31162e0d1317ed814b4af011c..352aa0a7fdb604a0c83fff3198c1b649bbd3032f 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -312,6 +312,7 @@ namespace internal {
   F(ThrowConstructedNonConstructable, 1, 1)         \
   F(ThrowDerivedConstructorReturnedNonObject, 0, 1) \
   F(ThrowCalledNonCallable, 1, 1)                   \
+  F(ThrowCalledOnNullOrUndefined, 1, 1)             \
   F(CreateListFromArrayLike, 1, 1)                  \
   F(IncrementUseCounter, 1, 1)                      \
   F(GetOrdinaryHasInstance, 0, 1)                   \
@@ -858,6 +859,7 @@ namespace internal {
   F(FlattenString, 1, 1)                  \
   F(StringCharFromCode, 1, 1)             \
   F(StringCharAt, 2, 1)                   \
+  F(ExternalStringGetChar, 2, 1)          \
   F(OneByteSeqStringGetChar, 2, 1)        \
   F(OneByteSeqStringSetChar, 3, 1)        \
   F(TwoByteSeqStringGetChar, 2, 1)        \